14 research outputs found
Crescimento de raÃzes de biótipos de capim-arroz resistente e suscetÃvel ao quinclorac em competição
Full text linkEffect of temperature and moisture on rates of carbon mineralization in a Mediterranean oak forest soil under controlled and field conditions
No full textSurface soil organic carbon pools, mineralization and CO2 efflux rates under different land-use types in Central Panama
No full textPositive and negative effects of allochthonous dissolved organic matter and inorganic nutrients on phytoplankton growth
No full textMesoscale regulation comes from the bottom-up: intertidal interactions between consumers and upwelling
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Natural variation of toxicity in encrusting sponge Crambe crambe (Schmidt) in relation to size and environment
No full textThe presence of intraspecific variation in toxicity and its relationship with biological or ecological factors were studied in the spongeCrambe crambe. Within-specimen (periphery and central part), between-size (10,000 mm2) and between-habitat (well-illuminated and dark communities) variations in toxicity were evaluated by the Microtox bioassay. Quantitative differences were detected that were not attributable to within-specimen variation but to size and habitat effects. Habitat comparisons showed that sponges in the shaded habitat were significantly more toxic than those of the well-illuminated community. Sponges of the smaller size classes displayed significantly less toxicity than the medium-sized specimens. Results are interpreted under the optimal defense theory and their ecological implications are considered.Peer reviewe
Natural variation of toxicity in encrusting spongeCrambe crambe (Schmidt) in relation to size and environment
No full textStructure and composition of a Mediterranean grassland community grown under Free-Air CO 2
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